For making the jump solid, use salt if it's warm and water if it's cold
Run your ski over the length of the rail to see if it slides smooth and fix any really bad spots if you can. Steel generally slides pretty well tho
Shouldn't need to detune your edges if you've been hitting rails already on em a good amount
Quick answers from my phone but there are tons of threads on this, google site:newschoolers.com + first urban or urban advice or whatever and you'll find a lot of info
Any specific questions I'm happy to answer tho